根据中文释义填写单词。Unfortunately, a new difficulty has ______ (出现).
With the development of _________ (技术）, more and more practical machines have been invented.
At first, I thought these flowers were real, but they are __________ (人造的）.
I asked his name, but he didn’t_________（响应）.
We greatly _________(感激) your timely help.
Mrs Brown's dog _________（咬）the mailman when he was delivering newspapers yesterday afternoon.
Your proposal sounds very ___________ (吸引人的)．
He is quite___________（有信心）that he will pass the examination.
The famous band from the US will give their __________ (表演) in the Capital Concert Hall.
He is busy sending out ___________ (请帖).
The _____（本来的） owner of the house was the Duke of Wellington.
Some scientists like to e______ with small white mice.
Last year my brother g______ from Beijing University and found a job there.
With new technology used in a__________ more crops are produced.
His book, p___________ the year before last, still sells well now.